Siemens SIMATIC PCS 7 Operating Manual page 94

Configuring the safety program
7.2 Creating the safety program
You can use this entry in the diagnostic buffer to identify the F block with the invalid floating-
point number (NaN).
If you are not able to prevent these events from occurring in your safety program, you will
need to decide, on the basis of your application, whether you wish to respond to them in your
safety program.
94
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB